Lead Sash Window Weights
What Are Sash Window Weights?
A sash window weight acts as a heavy counterbalance for traditional sliding timber windows, allowing the panels to stay securely in position at any height. These weights ensure smooth, balanced movement, making the window easy to open and close while preventing heavy sashes from slamming shut or falling unexpectedly.
Smooth Operation
High-density lead provides an excellent counterbalance, ensuring timber sash windows slide smoothly and quietly without sticking.
High Durability
Corrosion-resistant lead weights offer lifetime durability for new builds and traditional Grade II listed property restorations.
Easy Installation
Features a central hole for standard 6mm to 8mm sash cords, utilising easy-to-cut lead for a precise fit inside the window box.
Lead Sash Window Weight Sizes & Dimensions
Square Lead Weights – 600mm Length +
| Section Size (mm) | Length (mm) | Weight (kg) | Qty Per Pallet |
|---|---|---|---|
| 50 x 50 | 600 | 16.5 | 60 |
| 45 x 45 | 600 | 12.75 | 80 |
| 40 x 40 | 600 | 10.0 | 100 |
| 38 x 38 | 600 | 9.0 | 110 |
| 32 x 32 | 600 | 6.5 | 150 |
| 25 x 25 | 600 | 3.7 | 270 |
Square Lead Weights – 1200mm Length +
| Section Size (mm) | Length (mm) | Weight (kg) | Qty Per Pallet |
|---|---|---|---|
| 50 x 50 | 1200 | 33.0 | 30 |
| 45 x 45 | 1200 | 25.5 | 40 |
| 40 x 40 | 1200 | 20.0 | 50 |
| 38 x 38 | 1200 | 18.0 | 55 |
| 32 x 32 | 1200 | 13.0 | 75 |
| 50 x 35 | 1200 | 22.2 | 45 |
Round Lead Weights – 600mm Length +
| Diameter Size (mm) | Length (mm) | Weight (kg) | Qty Per Pallet |
|---|---|---|---|
| Ø 50 | 600 | 12.0 | 80 |
| Ø 45 | 600 | 9.8 | 110 |
| Ø 38 | 600 | 6.8 | 140 |
Round Lead Weights – 1200mm Length +
| Diameter Size (mm) | Length (mm) | Weight (kg) | Qty Per Pallet |
|---|---|---|---|
| Ø 50 | 1200 | 24.0 | 40 |
| Ø 45 | 1200 | 19.7 | 55 |
| Ø 38 | 1200 | 13.6 | 70 |
*Manufacturing Tolerances: Weight: ±5% | Section: +0.5mm / -0mm | Length: +10mm / -0mm | Cord Hole Diameter: 10mm – 10.5mm
Sustainability & Product Details
We maintain a strict commitment to recycling and the responsible sourcing of lead. Choosing lead weights manufactured under ISO environmental standards ensures safe disposal, reuse, and minimal ecological impact.
At DKL Metals, we supply a wide range of sash window weights in different sizes to match your exact requirements. Other standard sizes are also available on request, giving you the flexibility to find the perfect solution for your project. For advice, availability, or orders, contact our sales team now!
Learn More About DKL Metals – About Sash Window Weights
Frequently Asked Questions
How do I choose the correct size of lead sash weight? +
The correct profile size depends entirely on your window frame’s total glass mass and the inner cavity space. As a foundational trade guideline, each individual sash weight should equal approximately half of the total weight of the corresponding window sash panel. Always verify the inner box space dimensions before final ordering to prevent rubbing.
Are lead window weights acceptable for Grade II listed properties? +
Yes. Traditional lead counterweights are highly recommended and widely approved for historical renovations and period restorations. They help maintain original architectural profiles, mechanical authenticity, and structural frame dimensions better than modern spring mechanisms or iron profiles.
Do window counterweights improve building thermal efficiency? +
When counterweights are balanced accurately, they pull the upper and lower sashes flush against the frame timber. This forms a structural seal that eliminates common air gaps, effectively minimising cold drafts, lowering energy loss, and improving year-round indoor room comfort.